Results 31 to 40 of about 447,526 (198)

Low-Dose CT Image Reconstruction With a Deep Learning Prior

IEEE Access, 2020
In low-dose computed tomography (LDCT), a penalized weighted least squares (PWLS) approach that incorporates the Poisson statistics of X-ray photons can significantly reduce excessive quantum noise.
Hyoung Suk Park, Kyungsang Kim, Kiwan Jeon   +2 more
doaj   +1 more source

The relationship between diffuse and total radiation at the Solar and Ozone Observatory in Hradec Králové

Meteorologische Zeitschrift, 1996
The daily and monthly data of the total radiation are used for estimation of the relationship between diffuse and total radiation in Hradec Králové. Analyses were expressed in parameters with the use of the method of least squares and a "Robust Locally ...
Michal Janouch
doaj   +1 more source

An iterative algorithm of NWTLS-EC for three dimensional-datum transformation with large rotation angle

Geodesy and Geodynamics, 2014
The Gauss-Markov (GM) model and the Errors-in-Variables (EIV) model are frequently used to perform 3D coordinate transformations in geodesy and engineering surveys.
Hu Chuan, Chen Yi
doaj   +1 more source

WTLS iterative algorithm of 3D similarity coordinate transformation based on Gibbs vectors

Earth, Planets and Space, 2020
The 3D similarity coordinate transformation is fundamental and frequently encountered in many areas of work such as geodesy, engineering surveying, LIDAR, terrestrial laser scanning, photogrammetry, machine vision, etc.
Huaien Zeng, Guobin Chang, Haiqing He, Kezhao Li   +3 more
doaj   +1 more source

Improving likelihood-based inference in control rate regression [PDF]

, 2017
Control rate regression is a diffuse approach to account for heterogeneity among studies in meta-analysis by including information about the outcome risk of patients in the control condition.
Guolo, Annamaria
core   +2 more sources

Deformation analysis by an improved similarity transformation

Applied Computing and Geosciences
In this contribution, deformation analysis is rigorously performed by a non-linear 3-D similarity transformation. In contrast to traditional methods based on linear least-squares (LLS), here we solve a non-linear problem without any linearization.
Vahid Mahboub
doaj   +1 more source

Estimating satellite and receiver differential code bias using a relative Global Positioning System network [PDF]

Annales Geophysicae, 2019
Precise total electron content (TEC) is required to produce accurate spatial and temporal resolution of global ionosphere maps (GIMs). Receivers and satellite differential code biases (DCBs) are one of the main error sources in estimating precise TEC ...
A. A. Elghazouly, M. I. Doma, A. A. Sedeek   +2 more
doaj   +1 more source

A weighted adjustment of a similarity transformation between two point sets containing errors

Journal of Geodetic Science, 2017
For an adjustment of a similarity transformation, it is often appropriate to consider that both the source and the target coordinates of the transformation are affected by errors.
Marx C.
doaj   +1 more source

An Improved Point-to-Plane Registration Method for Terrestrial Laser Scanning Data

IEEE Access, 2018
Registration of point clouds is vital in point cloud data processing. By registering, the point cloud data from different views are transformed into a common coordinate system.
Wuyong Tao, Xianghong Hua, Kegen Yu, Xiaoxing He, Xijiang Chen   +4 more
doaj   +1 more source

Different estimation methods for the generalized unit half-logistic geometric distribution: Using ranked set sampling

AIP Advances, 2023
The generalized unit half-logistic geometric distribution (GUHLGD) is a modern two-parameter unit distribution with attractive shape flexibility for the corresponding probability density and hazard rate functions.
Najwan Alsadat, Amal S. Hassan, Ahmed M. Gemeay, Christophe Chesneau, Mohammed Elgarhy   +4 more
doaj   +1 more source